Discovery Kit for STM32F0 Series Microcontrollers with STM32F072RB

UM1690 User manual Discovery kit for STM32F0 Series microcontrollers with STM32F072RB

Introduction The STM32F072 Discovery kit (32F072BDISCOVERY) helps users to discover the full features of the STM32F0 Series and develop their applications. It is based on an STM32F072RBT6 microcontroller and includes an ST-LINK/V2 embedded debug tool interface, ST MEMS gyroscope, LEDs, push-buttons, linear touch sensor, touch keys, RF EEPROM connector and a USB Mini-B connector.

Figure 1. STM32F072 Discovery kit

Picture is not contractual.

March 2020 UM1690 Rev 3 1/27

www.st.com Contents UM1690

Contents

1 Features ...... 6

2 Ordering information ...... 7 2.1 Product marking ...... 7 2.2 Codification ...... 7

3 Development environment ...... 8 3.1 System requirements ...... 8 3.2 Development toolchains ...... 8 3.3 Demonstration software ...... 8

4 Conventions ...... 8

5 Hardware layout ...... 9 5.1 Embedded ST-LINK/V2 ...... 12 5.1.1 Using ST-LINK/V2 to program/debug the STM32F072 on board . . . . . 12 5.1.2 Using ST-LINK/V2 to program/debug an external STM32 application . . 13 5.2 Power supply and power selection ...... 14 5.3 LEDs ...... 14 5.4 Pushbuttons ...... 14 5.5 Linear touch sensor / touch keys ...... 15 5.6 USB device support ...... 15 5.7 BOOT0 configuration ...... 15 5.8 Embedded USB Bootloader ...... 15 5.9 Gyroscope MEMS (ST MEMS I3G4250D) ...... 16 5.10 JP2 (Idd) ...... 16 5.11 Extension and RF EEPROM connector ...... 16 5.12 OSC clock ...... 18 5.12.1 OSC clock supply ...... 18 5.12.2 OSC 32 KHz clock supply ...... 18 5.13 Solder bridges ...... 19 5.14 Extension connectors ...... 20

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6 Mechanical drawing ...... 25

7 Revision history ...... 26

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3 List of tables UM1690

List of tables

Table 1. Ordering information ...... 7 Table 2. Codification explanation ...... 7 Table 3. ON/OFF conventions ...... 8 Table 4. Jumper states ...... 12 Table 5. Debug connector CN4 (SWD) ...... 13 Table 6. Extension and RF EEPROM connector (CN3) ...... 17 Table 7. Solder bridges...... 19 Table 8. MCU pin description versus board function ...... 20 Table 9. Document revision history ...... 26

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List of figures

Figure 1. STM32F072 Discovery kit...... 1 Figure 2. Hardware block diagram ...... 9 Figure 3. Top layout ...... 10 Figure 4. Bottom layout ...... 11 Figure 5. STM32F072 Discovery kit connections ...... 12 Figure 6. ST-LINK connections ...... 13 Figure 7. Extension and RF EEPROM connector ...... 16 Figure 8. STM32F072 Discovery kit mechanical drawing ...... 25

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5 Features UM1690

1 Features

The STM32F072 Discovery kit offers the following features: • STM32F072RBT6 microcontroller based on the Arm®(a) Cortex®-M0 processor, featuring 128 Kbytes of Flash memory, 16 Kbytes of SRAM in an LQFP64 package • USB FS with Mini-B connector • I3G4250D ST MEMS motion sensor 3-axis digital output gyroscope • One linear touch sensor or four touch keys • Six LEDs: – LD1 (red/green) for USB communication – LD2 (red) for 3.3 V power on – Four user LEDs: LD3 (red), LD4 (orange), LD5 (green) and LD6 (blue) • Two push-buttons (user and reset) • RF EEPROM daughterboard connector • Extension header for LQFP64 I/Os for quick connection to a prototyping board and easy probing • On-board ST-LINK/V2 with switch to use the kit as a standalone ST-LINK/V2 (with SWD connector for programming and debugging) • Flexible power supply options: – USB bus or external 5 V supply voltage • Power supply output for external applications: 3 V and 5 V • Comprehensive free software including a variety of examples, part of STM32CubeF0 or STM32SnippetsL0 packages or STSW-STM32139 for legacy Standard Libraries usage

a. Arm is a registered trademark of Arm Limited (or its subsidiaries) in the US and or elsewhere.

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2 Ordering information

To order the 32F072BDISCOVERY Discovery kit, refer to Table 1. Additional information is available from the datasheet and reference manual of the target STM32.

Table 1. Ordering information Order code Board reference Target STM32

STM32F072B-DISCO MB1076 STM32F072RBT6

2.1 Product marking Evaluation tools marked as “ES” or “E” are not yet qualified and are therefore not ready to be used as reference designs or in production. Any consequences arising from such usage will not be at ST’s charge. In no event will ST be liable for any customer usage of these engineering sample tools as reference designs or in production. ‘E’ or ‘ES’ marking examples of location: • on the targeted STM32 that is soldered on the board (For an illustration of STM32 marking, refer to the section ‘Package information’ of the STM32 datasheet at www.st.com). • next to the evaluation tool ordering part number, that is stuck or silkscreen printed on the board

2.2 Codification The meaning of the codification is explained in Table 2.

Table 2. Codification explanation 32XXYYZDISCOVERY Description Example: 32F072BDISCOVERY

MCU series in STM32 32-bit Arm 32XX STM32F0 Series Cortex MCUs YY MCU product line in the series STM32F072 STM32 Flash memory size: Z 128 Kbytes – B for 128 Kbytes DISCOVERY Discovery kit Discovery kit

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3 Development environment

3.1 System requirements • Windows® OS (7, 8 and 10), Linux® 64-bit or macOS®(a) (b) • USB Type-A to Mini-B cable

3.2 Development toolchains • IAR™ - EWARM(c) • Keil® - MDK-ARM(c) (d) • STMicroelectronics - STM32CubeIDE

3.3 Demonstration software The demonstration software, included in the STM32Cube MCU Package, is preloaded in the STM32 Flash memory for easy demonstration of the device peripherals in standalone mode. The latest versions of the demonstration source code and associated documentation can be downloaded from the www.st.com/stm32f0-discovery webpage.

4 Conventions

Table 3 provides the definition of some conventions used in the present document.

Table 3. ON/OFF conventions Convention Definition

Jumper JPx ON Jumper fitted Jumper JPx OFF Jumper not fitted Solder bridge SBx ON SBx connections closed by solder Solder bridge SBx OFF SBx connections left open

a. macOS® is a trademark of Apple Inc. registered in the U.S. and other countries. b. All other trademarks are the property of their respective owners. c. On Windows® only. d. Free MDK-ARM for Arm® Cortex®-M0/M0+ cores.

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5 Hardware layout

The STM32F072 Discovery kit is designed around the STM32F072RBT6 microcontroller in a 64-pin LQFP package. Figure 2 illustrates the connections between the STM32F072RBT6 and its peripherals (ST- LINK/V2, ST MEMS gyroscope I3G4250D, LEDs, push buttons, linear touch sensor, touch keys, RF EEPROM connector and a USB Mini-B connector). Figure 3 and Figure 4 help to locate these features on the STM32F072 Discovery board.

Figure 2. Hardware block diagram

Mini-USB

Embedded ST-LINK/V2 SWD

STM32F072RBT6

I/O I/O

I/O RESET Header Header

LEDs B2 LD3 to LD6 RESET

I3G4250D B1 USER Linear touch sensor

Mini-USB EXT/RF-EEP

MS33267V2

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Figure 3. Top layout

LD2 ST-LINK/V2 PWR LED LD1 USB ST-LINK USB USER COM LED

CN3 extension or RF EEPROM connector

3 V power supply 5 V power supply input/output input/output

CN4 CN5 SWD connector ST-LINK/DISCOVERY selector

LD3 (red LED) LD4 LD5 (green LED) (orange LED) JP2 LD6 (blue LED) Idd measurement

STM32F072RBT6

B1 B2 user button reset button

Linear touch sensor /touchkeys

MSv33268V2

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Figure 4. Bottom layout

P2 connector P1 connector

SB1, 3, 6, 8 Reserved SB2, 4, 7, 9 Default SB5 STM_RST

SB10 SB11,12 NRST RX, TX

JP2

SB15 SB19 VBAT MCO SB13, 14 X2 crystal SB16 VDDIO2 SB17, 18 SB20, 23 X3 crystal USB-USER SB21 B1-USER SB22 SB24, 25 GND, VDD B2-RESET SB26 VDDA

SB27-32 Touch sensor

MSv33269V2

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5.1 Embedded ST-LINK/V2 The ST-LINK/V2 programming and debugging tool is integrated on the STM32F072 Discovery kit. The embedded ST-LINK/V2 can be used in 2 different ways according to the jumper states (see Table 4): • Program/debug the MCU on board • Program/debug an MCU in an external application board using a cable connected to SWD connector CN4 The embedded ST-LINK/V2 supports only SWD for STM32 devices. For information about debugging and programming features, refer to user manual UM1075 (ST-LINK/V2 in-circuit debugger/programmer for STM8 and STM32), which describes in detail all the ST-LINK/V2 features.

Table 4. Jumper states Jumper state Description

Both CN5 jumpers ON ST-LINK/V2 functions enabled for on board programming (default) ST-LINK/V2 functions enabled for application through external CN4 Both CN5 jumpers OFF connector (SWD supported)

5.1.1 Using ST-LINK/V2 to program/debug the STM32F072 on board To program the STM32F072 on board, simply plug in the two jumpers on CN5, as shown in Figure 5 in pink, but do not use the CN4 connector as that could disturb communication with the STM32F072RBT6 of the STM32F072 Discovery kit.

Figure 5. STM32F072 Discovery kit connections

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5.1.2 Using ST-LINK/V2 to program/debug an external STM32 application It is very easy to use the ST-LINK/V2 to program the STM32 on an external application. Simply remove the 2 jumpers from CN5 as shown in Figure 6, and connect the application to the CN4 debug connector according to Table 5. Note: SB10 must be OFF if CN4 pin 5 is used by the external application.

Table 5. Debug connector CN4 (SWD) Pin CN4 Designation

1 VDD_TARGET VDD from application 2 SWCLK SWD clock 3 GND Ground 4 SWDIO SWD data input/output 5 NRST Reset of the target MCU 6 SWO Reserved

Figure 6. ST-LINK connections

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5.2 Power supply and power selection The power supply is provided either by the host PC through the USB ST-LINK or USB USER connector, or by an external 5 V power supply. The D1 and D2 diodes protect the 5 V and 3 V pins from external power supplies: • 5 V and 3 V can be used as output power supplies when another application board is connected to pins P1 and P2. In this case, the 5 V and 3 V pins deliver a 5 V or 3 V power supply and the power consumption must be lower than 100 mA. • 5 V can also be used as input power supplies, for instance when the USB connector is not connected to the PC. In this case, the STM32F072 Discovery kit must be powered by a power supply unit or by an auxiliary equipment complying with standard EN-60950-1: 2006+A11/2009, and must be Safety Extra Low Voltage (SELV) with limited power capability.

5.3 LEDs • LD1 COM: LD1 default status is red. LD1 turns to green to indicate that communications are in progress between the PC and the ST-LINK/V2. • LD2 PWR: This red LED indicates that the board is powered. • User LD3: This red user LED is connected to the I/O PC6 of the STM32F072RBT6. • User LD4: This orange user LED is connected to the I/O PC8 of the STM32F072RBT6. • User LD5: This green user LED is connected to the I/O PC9 of the STM32F072RBT6. • User LD6: This blue user LED is connected to the I/O PC7 of the STM32F072RBT6.

5.4 Pushbuttons B1 USER: User and Wake-Up button connected to the I/O PA0 of the STM32F072RBT6. B2 RESET: The push button connected to NRST is used to reset the STM32F072RBT6.

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5.5 Linear touch sensor / touch keys To demonstrate touch sensing capabilities, the STM32F072 Discovery kit includes a linear touch sensor, which can be used either as a 3-position linear touch sensor or as 4 touch keys. Both functions are illustrated in the demonstration software. 3 pairs of I/O ports are assigned to the linear touch sensor / touch keys. Each pair must belong to the same analog switch group: • PA2, PA3 (group 1) • PA6, PA7 (group 2) • PB0, PB1 (group 3) To minimize the noise, these pairs are dedicated to the linear touch sensor and the touch keys and are not connected to external headers. To design a touch sensing application, refer to the following documentation and firmware: • For details concerning I/O ports, refer to the STM32F072RBT6 datasheet. • For information on software development, see DISCOVER application software on www.st.com/stm32f0-discovery. • STM32 touch sensing library available from www.st.com/stm32f0-discovery.

5.6 USB device support The STM32F072RBT6 MCU is also used to drive the second USB Mini-B connector (USB USER) which allows the board to be used as a USB Device. The STM32F072 Discovery kit can then act as a USB joystick, mouse, or other similar device. If both USBs are connected, diodes D1 and D2 protect the board and use the power from the USB ST-LINK. The board can be powered through this USB USER connector, in which case LED2 PWR lights up, LED1 COM blinks and it can run an application in standalone mode. The STM32F072RBT6 MCU controls the USB USER through PA11 and PA12.

5.7 BOOT0 configuration BOOT0 is at level “0” through pull-down resistor R33. If the user wants to set BOOT0 at level “1”, it can be configured by setting a jumper between P2.6 (BOOT0) and P2.5 (VDD). This facility is offered for fast and instantaneous configuration. Note: If it is needed to set BOOT0 at level "1" continuously, then unsolder resistor R33 to avoid a consumption of 6 mA while connecting pin P2.6 (BOOT0) and P2.5 (VDD) with a jumper or with a wire.

5.8 Embedded USB Bootloader The STM32F072 line microcontrollers embed a bootloader allowing the programming of blanked device or the upgrade device firmware over the USB without the need of a specific programmer. When using this Discovery kit, the STM32F072RBT6 MCU firmware can be thus programmed through the second USB Mini-B connector (USER USB). To program the microcontroller Flash memory using this approach, a jumper must be set between BOOT0 (P2.6) and VDD (P2.5), and a cable connected between the USER USB

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connector of the board and a PC. On the PC side, it is required to use the Device Firmware Upgrade Utility named "DfuSe". This software (STSW-STM32080) and its associated user manual (UM0412) are available from www.st.com. Several application notes are also available on that topic. • AN2606: STM32 microcontroller system memory boot mode • AN3156: USB DFU protocol used in the STM32 bootloader Note: ST-LINK utilities must not be used when the DFU utility is running.

5.9 Gyroscope MEMS (ST MEMS I3G4250D) The I3G4250D is an ultra-compact, low-power, three-axis angular rate sensor. It includes a sensing element and an IC interface able to provide the measured angular rate to the external world through the I2C/SPI serial interface. The I3G4250D has dynamically-user-selectable full scales: • ±245 dps • ±500 dps • ±2000 dps The I3G4250D is capable of measuring rates. The STM32F072RBT6 MCU controls this motion sensor through the SPI interface.

5.10 JP2 (Idd) Jumper JP2, labeled Idd, allows the consumption of STM32F072RBT6 to be measured by removing the jumper and connecting an ammeter. • Jumper ON: STM32F072RBT6 is powered (default). • Jumper OFF: an ammeter must be connected to measure the STM32F072RBT6 current, (if there is no ammeter, the STM32F072RBT6 is not powered).

5.11 Extension and RF EEPROM connector This connector is able to accept an extension board or the RF EEPROM board ANT7- M24LR-A (see application note How to design an antenna for dynamic NFC tags (AN2972) for more details).

Figure 7. Extension and RF EEPROM connector

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Table 6. Extension and RF EEPROM connector (CN3) Pin CN3 Designation

1 I2C SDA Data signal for I2C 2 NC Not connected 3 I2C SCL Clock signal for I2C 4 EXT_RESET Reset signal for extension board 5 3V 3 volt power supply 6 NC Not connected 7 GND Ground 8 5V 5 volt power supply

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5.12 OSC clock By default, the STM32F072RBT6 clock source is the high-speed internal (HSI) RC oscillator. Other clock sources are described hereunder.

5.12.1 OSC clock supply If PF0 and PF1 are only used as GPIOs instead of clock, then SB17 and SB18 are ON and R36 and R37 are removed (SB19 must be OFF). • MCO from ST-LINK (from MCO of the STM32F103). This frequency cannot be changed, it is fixed at 8 MHz and connected to PF0-OSC_IN of the STM32F072RBT6. The required configuration is: – SB19 ON and SB17 OFF – R36 removed • Oscillator on board (from X3 crystal, not provided). For typical frequencies and its capacitors and resistors, refer to the STM32F072RBT6 datasheet. The required configuration is: – SB17, SB18, SB19 OFF – X3, R36, R37, C22, C23 soldered • Oscillator from external PF0 (from external oscillator through pin 7 of the P1 connector). The required configuration is: –SB17 ON –SB19 OFF – R36 removed

5.12.2 OSC 32 KHz clock supply If PC14 and PC15 are only used as GPIOs instead of clock, then SB13 and SB14 are ON, and R34 and R35 are removed. • Oscillator on board (from X2 crystal, not provided). The required configuration is: – SB13, SB14 OFF – X2, C19, C20, R34, R35 soldered • Oscillator from external PC14 (from external oscillator trough the pin 5 of P1 connector). The required configuration is: –SB14 ON – R35 removed

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5.13 Solder bridges Table 7. Solder bridges Bridge State(1) Description

PF0, PF1 are connected to P1 (R36, R37 must not be fitted and SB19 must be ON OFF). SB17,18 (X3 crystal) X3, C22, C23, R36 and R37 provide a clock. PF0, PF1 are disconnected from OFF P1. ON PC14, PC15 are only connected to P1. Remove only R34, R35 SB13,14 (X2 crystal) X2, C19, C20, R34 and R35 deliver a 32 KHz clock. PC14, PC15 are not OFF connected to P1. OFF MCO signal of STM32F103C8T6 is not used. SB19 (MCO) MCO clock signal from STM32F103C8T6 is connected to OSC_IN of ON STM32F072RBT6. (SB17 must be OFF). SB2,4,7,9 (Default) ON Reserved, do not modify. SB1,3,6,8 (Reserved) OFF Reserved, do not modify. SB24,25 (GND,VDD) ON Reserved, do not modify. SB11,12 (RX,TX) OFF Reserved, do not modify OFF Reserved to the linear touch sensor. PA2,3,6,7 and PB0,1 are not available. SB27,28,29,30,31,32 PA2,3,6,7 and PB0,1 are available then remove R38,39,40 and C26,27,28. (the (touch sensor) ON linear touch sensor is not available)

SB20,23 (USB- OFF Reserved to the USB USER CN2. PA11,12 are not available. USER) ON PA11,12 are available then remove R12,13. (the USB USER CN2) ON B1 pushbutton is connected to PA0. SB21 (B1-USER) OFF B1 pushbutton is not connected to PA0. ON B2 pushbutton is connected to the NRST pin of the STM32F072RBT6 MCU. SB22 (B2-RESET) OFF B2 pushbutton is not connected the NRST pin of the STM32F072RBT6 MCU. T_NRST pin of the STM32F103C8T6 (ST-LINK/V2) and CN4.5 are connected to ON the NRST pin of the STM32F072RBT6 MCU. SB10 (NRST) T_NRST pin of the STM32F103C8T6 (ST-LINK/V2) and CN4.5 are not OFF connected to the NRST pin of the STM32F072RBT6 MCU. OFF No incidence on STM32F103C8T6 (ST-LINK/V2) NRST signal. SB5 (STM_RST) ON STM32F103C8T6 (ST-LINK/V2) NRST signal is connected to GND. ON VBAT Power is supplied by VDD SB15 (VBAT) OFF VBAT Power is supplied by P1.3 connector ON VDDIO2 Power is supplied by VDD SB16 (VDDIO2) OFF VDDIO2 Power is supplied by P2.18 connector ON VDDA Power is supplied by VDD through L1 inductance. SB26 (VDDA) OFF VDDA Power is supplied by P2.19 connector

1. The default state is in bold.

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5.14 Extension connectors The male headers P1 and P2 can connect the STM32F072 Discovery kit to a standard prototyping/wrapping board. STM32F072RBT6 GPIOs are available on these connectors. P1 and P2 can also be probed by an oscilloscope, logical analyzer or voltmeter.

Table 8. MCU pin description versus board function MCU pin Board function (1) Main function num. pin LQFP64 System Linear touch sensor I3G4250D EXT/ RF-E2P Pushbutton LED USB USER I/O Free Power supply CN3 CN4 P1 P2 SBx ------BOOT0 60 6 - BOOT0 ------NRST 7 510 - - NRST RESET

PA0 14 ------15 - - USER

PA1 15 ------16 - - PA1

PA2 16 ------17 - SB27 TS_G1_IO3

PA3 17 ------18 - SB28 TS_G1_IO4

PA4 20 ------21 - - PA4

PA5 21 ------22 - - PA5

PA6 22 ------23 - SB29 TS_G2_IO3

PA7 23 ------24 - SB30 TS_G2_IO4

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Table 8. MCU pin description versus board function (continued) MCU pin Board function (1) Main function Main LQFP64 pin num. System Linear touch sensor I3G4250D EXT/ RF-E2P Pushbutton LED USB USER Free I/O Power supply CN3 CN4 P1 P2 SBx

PA8 41 ------25 - PA8

PA9 42 ------24 - PA9

PA10 43 ------23 - PA10

PA11 44 ------22 SB23 DM

PA12 45 ------21 SB20 DP ------PA13 46 4 - 20 - SWDIO - - PA14 49 ------2 17 SWCLK

PA15 50 ------16 - PA15

PB0 26 ------27 - SB31 TS_G3_IO2

PB1 27 ------28 - SB32 TS_G3_IO3

PB2 28 ------29 - - PB2

PB3 55 ------11 - PB3

PB4 56 ------10 - PB4

PB5 57 ------9 - PB5

PB6 58 ------8 - PB6

PB7 59 ------7 - PB7

PB8 61 ------4 - PB8

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PB9 62 ------3 - PB9

PB10 29 ------3 - 30 - - SCL

PB11 30 ------1 - 31 - - SDA

PB12 33 ------32 - - PB12

PB13 34 ------32 - SCL/ SPC

PB14 35 ------31 - SDO

PB15 36 ------30 - SDA/ SDI/

PC0 8 ------11 - - CS_I2C/ SPI

PC1 9 ------12 - - INT1

PC2 10 ------13 - - INT2

PC3 11 ------14 - - PC3

PC4 24 ------25 - - PC4

PC5 25 ------4 - 26 - - EXT_RESET

PC6 37 ------29 - RED

PC7 38 ------28 - BLUE

PC8 39 ------27 - ORANGE

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PC11 52 ------14 - PC11

PC12 53 ------13 - PC12

PC13 2 ------4 - - PC13

PC14 3 ------5 - SB14 OSC32_IN - PC15 4 ------6 SB13 OSC32_OUT

PD2 54 ------12 - PD2 ------PF0 5 7 - SB17 OSC_IN - PF1 6 ------8 SB18 OSC_OUT

VBAT 1 ------3 - SB15 VDD

VDDA 13 ------19 SB26 VDD

VDDIO2 48 ------18 SB16 VDD

------20 5 - VDD ------8 - - 1 - 5V

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------5 - 1 - - 3V ------7322 GND ------9 - - GND ------19 GND ------33 33 GND 1. Depending on SBx, connected to STM32F072RBT6 MCU pin or board function. (Refer to the schematics on www.st.com for more detail)

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6 Mechanical drawing

Figure 8. STM32F072 Discovery kit mechanical drawing

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7 Revision history

Table 9. Document revision history Date Revision Changes

18-Dec-2013 1 Initial release. Updated Figure 1: STM32F072 discovery board. Added Section 4.7 and Section 4.8. 23-June-2014 2 Added Figure 12: MEMS and USB and Figure 13: Linear sensor and pushbutton. Updated ST MEMS gyroscope and user LEDs descriptions in Features, Gyroscope MEMS (ST MEMS I3G4250D), LEDs, and across the document. Removed Electrical schematics. 19-Mar-2020 3 Reorganized the entire document: – Updated Features and Ordering information – Added Product marking, Codification and Development environment

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